[RAC,Security Solution]Update alerts mappings to ECS 1.12 (elastic#11…

…8812)

* Update output directory for generative script

These files were moved in elastic#98935 but the script has become out of date.

* Update ECS fieldmap with ECS 1.12

This fieldmap was missing fields from ECS 1.11+. Notable ommissions were
the threat.indicator and threat.enrichments fieldsets.

* Remove non-additive mappings changes

These are incompatible with the current alerts framework.

* Add only necessary threat fields for CTI features

This could probably be pared down further, as most of these fields are
not critical for CTI features. Additionally, these additions now exceed
the limit of 1000 fields and is causing an error in the ruleRegistry
bootstrapping.

* Remove file.pe threat fields

* Remove geo threat indicator fields

* Remove all threat.indicator mappings

These are not relevant for alerts, which will only have enrichments.

* increments index mappings total fields limit to 1200

Co-authored-by: Ece Ozalp <ozale272@newschool.edu>
Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>